Again Signal

After a failed marriage, Tae-Hwa Han, an omega, has a one-night stand with his brother-in-law, Yi Shin Yoon, an alpha and famous actor, resulting in a child—Si-Woo. Four years later, Yi Shin reappears in Tae-Hwa’s life, unaware that he has a son. Tae-Hwa keeps this secret, grappling with old feelings and the painful truth of their relationship. As they reconnect, Tae-Hwa must decide if they can rekindle their relationship—and whether Yi Shin will accept the son he never knew he had.

(Source: Tapas)

Note: Chapter count includes two Vacation side story chapters.